Watchmaker&#39;s calipers



m J 5 KAMPE zwazza WATCHMAKER S CALIPERS Filed May 2, 1955 A; 2 25 26 WELEZS;

WWW

WWW

Patented Apr. 28, 1936 UNITED STATES PATENT OFFICE 7 Claims.

The invention relates to improvements in watchmakers calipers of the type used for truing balance wheels and/or gear wheels and their staffs. Calipers of this type are shown in my U. S. Patent No. 848,831 of April 2, 1907 but it is the object of the present invention to provide a new and improved construction which may be more easily and less expens'ively manufactured and marketed, and may be more conveniently used, the improvements residing in the wheel gauging means for use in truing balance and/or gear wheels.

With the foregoing in view, the invention resides in the novel subject matter hereinafter described and claimed, description being accomplished by reference to the accompanying drawing.

Fig. 1 is a side elevation showing the improved calipers.

Fig. 2 is an edge view.

Fig. 3 is a transverse sectional view on line 3-3 of Fig. 1.

Fig. 4 is a longitudinal section partly in elevation as indicated by line 4--4 of Fig. 1.

Fig. 5 is a. disassembled perspective view of the gauging means.

Fig. 6 is a detail edge view similar to a portion of Fig. 2 but showing the indicator-carrying rod turned to a different position.

A preferred construction has been shown and will be rather specifically described, with the understanding however, that variations may be made within the scope of the invention as :claimed.

The calipers include two crossed levers pivoted together at I, the ends of one of said levers being denoted at 8 and 8 respectively and those of the other at 9 and 9*. These lever ends constitute jaws as usual, the jaws 8 and 9 being provided'with bearings I!) to engage the ends of a balance wheel staff while the jaws 8 and 9 are provided with bearings I to engage the ends of a gear wheel staff. The jaw 8 is provided with a cylindrical opening II and the jaw 8 is formed with a corresponding opening II of the same diameter. Insertable through either of these openings is a cylindrical body I2 having a transverse opening I3 in one end and a threaded stud I4 projecting longitudinally from its other end. One end of a cylindrical rod I passes through the opening I3 and lies against one side of the jaw 8 or 8 as the case may be, and a thumb nut I6 is threaded on the stud I4 to bear against the opposite side of said jaw. Preferably, the

rod I5 is slightly flattened at I! to non-rotatably lie against the jaw 8 or 8*. This rod preferably is of a length to project beyond the opposite jaw, the projecting end being preferably provided with a knurled head I8. When the calipers are held 5 in the left hand, the thumb may be placed against this head to effect swinging adjustment of the rod I5 toward or from the bearings II] or Ill as the case may be, and suificient tightening-of the nut I6 of course frictionally holds 10 said rod in the position to which it has been swung.

A slide I9 which is preferably in the form of a cylindrical body, is slidable and rotatable upon the rod I5, being formed with a transverse cy- 1 lindrical opening through which said rod passes rather snugly. At least the end 2I of the slide or body I9 projects a short distance laterally from the rod I5, said projecting end being provided with a central threaded stud 22. A wheel-gauging indicator 23, preferably cut from a flat metal strip, and preferably of double-ended form, is provided with an opening 24 which receives the end 2| of the slide or body I9, said indicator lying against the rod I5. A washer 25 which is preferably cupped as seen in Fig. 3, is placed on the stud 22, contacts with the indicator 23, and is engaged by a thumb nut 26 which is threaded on said stud 22. 30

When the nut 26 is loosened, the slide and the indicator may be adjusted along the rod I5 and the indicator may be turned about its pivot to be set in the desired relation with the wheel being tested. Tightening of the nut 26 frictionally binds the slide I9 and the indicator 23 against the rod I5 so that they are tightly held in adjusted position.

It will be seen from the above that the calipers are readily adjustable to dispose the indicator 23 in the proper relation with the wheel being tested, adjustments being attained by swinging the rod I5 toward or from the bearings I0 or Ill by shifting the slide I9 along the rod I5, by rotating said slide on said rod, and by swinging the indicator 23 upon its pivotal mounting, all parts being held in adjusted position by tightening of the nuts I6 and 26.

Should it be desired, the rod I5 may be turned say one-half revolution within the opening I3 as seen in Fig. 6, so that said rod may then be turned in one direction or the other instead of rotating the slide I9 upon the rod I5, when setting the indicator 23. It will also be seen that if desired, the rod I 5 could be slid within the opening l3 instead of sliding the slide l9 along said rod. It will be clear that should two adjustments of the indicator be effected in these ways, namely, rotating the rod I5 in the opening l3 and sliding said rod in said opening, it would be possible to employ simplified connecting means between the indicator and the rod, but as no effort is herein made to claim the construction of any such simplified connecting means, it has not been illustrated.

By providing the improved calipers shown and described, they may be quickly and easily set as required, tightly held in set position, and advantageously used for truing only one wheel or for successively truing a plurality of wheels, for instance, in a watch factory.

While only a preferred construction has been illustrated, attention is again invited to the possibility of making variations within the scope of the invention as claimed.

I claim:

1. In watchmakers calipers having two jaws adjustable toward and from each other and provided with bearings for the ends of a wheel-carrying staff; a rod pivoted to one of said jaws for swinging adjustment toward and from said bearings, said rod projecting across and beyond the other of said jaws and having a cylindrical portion between said jaws, means for holding said rod in adjusted position, a slide of short length with respect to said rod, said slide being movable along and rotatable upon said cylindrical portion of said rod, a wheel-gauging indicator carried by said slide, and means for holding said slide and indicator in adjusted position.

2. In watchmakers calipers having two jaws adjustable toward and from each other and provided with bearings for the ends of a wheel-carrying stafi; a rod pivoted to one of said jaws for swinging adjustment toward and from said bearings, said rod projecting across and beyond the other of said jaws and having a cylindrical portion between said jaws, means for holding said rod in adjusted position, a slide of short length with respect to said rod, said slide being movable along and rotatable upon said cylindrical portion of said rod, a wheel-gauging indicator pivoted to said slide for swinging adjustment in a plane parallel with said rod, and means for holding said slide and indicator in any positions to which they may be adjusted.

3. In watchmakers calipers having a rod provided with a cylindrical portion; a slide movable along and rotatable upon said cylindrical portion of said rod, said slide having a lateral pivot, a

wheel-gauging indicator contacting with said rod and having an opening through which said pivot extends, and a nut threaded on said pivot for frictionally binding both said slide and said indicator against said rod when said nut is tightened.

4. In watchmakers calipers having a rod provided with a cylindrical portion; a slide having an opening through which said cylindrical portion or said rod passes, allowing said slide to move longitudinally upon and rotate upon said cylindrical rod portion, said slide having a cylindrical bearing portion projecting laterally from said rod, and a threaded stud projecting centrally from the outer end of said bearing portion, a wheel-gauging indicator lying against said rod and having an opening through which said bearing portion passes to allow pivotal adjustment of said indicator, and a nut threaded on said stud for frictionally binding said indicator and said slide against said rod when said nut is tightened.

5. In watchmakers calipers having an indicator-carrying rod; connecting means between said rod and the calipers, said connecting means embodying a pivot allowing swinging adjustment of said rod, a bearing allowing sliding and rotative adjustment of said rod, and means operable by a single manually actuated element for holding said rod normally against pivotal, sliding and rotative adjustment.

6. In watchmakers calipers having an opening; a cylindrical body slidable and rotatable in said opening, said body having a transverse opening in one of its ends and a threaded stud projecting longitudinally from its other end, an indicatorcarrying rod slidable in said transverse opening and disposed at one side of the calipers, and a clamping nut threaded on said stud at the other side of the calipers, said nut being operative to hold said cylindrical body and said rod in adjusted position.

7. In watchmakers calipers having an opening; a cylindrical body slidable and rotatable in said opening, said body having a transverse cylindrical opening in one of its ends and a threaded stud projecting longitudinally from its other end, an indicator-carrying rod having a cylindrical portion slidable and rotatable in said transverse opening, said rod being disposed at one side of the calipers, and a clamping nut threaded on said stud at the other side of the calipers, said nut being operative to hold said cylindrical body and said rod in adjusted position.

JOHN E. KAMPE. 

